If dj tried to get low and tackle him it would have been head to head. DJ's job is to tackle him. He did it the best way he could cleanly. If Welker didn't duck he would have hit him straight in the chest. Welker made the situation worse by ducking and hurt himself. If he didn't duck it would have still been a huge hit but a lot less likely concussed. What are these db's gonna have to do to not get a penalty in situations like this? Sooner or later they're gonna have to increase the pay for defensive players across the league to pay for fines because it's unavoidable. This is why I love college so much more than the NFL.